Finding the Fourth Proportional to 875.33, 1,200.71 and 857.10

Step by Step Solution

1. Step 1: Write the proportion equation
   875.33 : 1,200.71 = 857.10 : x
2. Step 2: Convert to fraction form
   875.33/1,200.71 = 857.10/x
3. Step 3: Cross multiply
   875.33x = 1,200.71 × 857.10
4. Step 4: Simplify right side
   875.33x = 1,029,128.54
5. Step 5: Solve for x
   x = 1,029,128.54/875.33
6. Step 6: Final answer
   x = 1,175.70